Reference Manual

00809-0100-4697, Rev EA October 2011

Rosemount 848T

Table 3-2. Resource Block Parameters

Number

Parameter

Description

60

DEFINE_WRITE_LOCK

Allows the operator to select how WRITE_LOCK behaves. The initial value is “lock

 

 

everything”. If the value is set to “lock only physical device” then the resource and transducer

 

 

blocks of the device will be locked but changes to function blocks will be allowed.

61

SAVE_CONFIG_NOW

Allows the user to optionally save all non-volatile information immediately.

62

SAVE_CONFIG_BLOCKS

Number of EEPROM blocks that have been modified since last burn. This value will count

 

 

down to zero when the configuration is saved.

63

START_WITH_DEFAULTS

0

= Uninitialized

 

 

1

= do not power-up with NV defaults

 

 

2

= power-up with default node address

 

 

3

= power-up with default pd_tag and node address

 

 

4

= power-up with default data for the entire communications stack (no application data)

64

SIMULATE_IO

Status of Simulate jumper/switch

65

SECURITY_IO

Status of Security jumper/switch

66

SIMULATE_STATE

The state of the simulate jumper

 

 

0

= Uninitialized

 

 

1

= Jumper/switch off, simulation not allowed

 

 

2

= Jumper/switch on, simulation not allowed (need to cycle jumper/switch)

 

 

3

= Jumper/switch on, simulation allowed

67

DOWNLOAD_MODE

Gives access to the boot block code for over the wire downloads

 

 

0

= Uninitialized

 

 

1

= Run Mode

 

 

2

= Download Mode

68

RECOMMENDED_ACTION

Enumerated list of recommended actions displayed with a device alert.

69

FAILED_PRI

Designates the alarming priority of the FAILED_ALM.

70

FAILED_ENABLE

Enabled FAILED_ALM alarm conditions. Corresponds bit for bit to the FAILED_ACTIVE. A bit

 

 

on means that the corresponding alarm condition is enabled and will be detected. A bit off

 

 

means the corresponding alarm condition is disabled and will not be detected.

71

FAILED_MASK

Mask of FAILED_ALM. Corresponds bit for bit to FAILED_ACTIVE. A bit on means that the

 

 

condition is masked out from alarming.

72

FAILED_ACTIVE

Enumerated list of failure conditions within a device.

73

FAILED_ALM

Alarm indicating a failure within a device which makes the device non-operational.

74

MAINT_PRI

Designates the alarming priority of the MAINT_ALM

75

MAINT_ENABLE

Enabled MAINT_ALM alarm conditions. Corresponds bit for bit to the MAINT_ACTIVE. A bit

 

 

on means that the corresponding alarm condition is enabled and will be detected. A bit off

 

 

means the corresponding alarm condition is disabled and will not be detected.

76

MAINT_MASK

Mask of MAINT_ALM. Corresponds bit for bit to MAINT_ACTIVE. A bit on means that the

 

 

condition is masked out from alarming.

77

MAINT_ACTIVE

Enumerated list of maintenance conditions within a device.

78

MAINT_ALM

Alarm indicating the device needs maintenance soon. If the condition is ignored, the device

 

 

will eventually fail.

79

ADVISE_PRI

Designates the alarming priority of the ADVISE_ALM

80

ADVISE_ENABLE

Enabled ADVISE_ALM alarm conditions. Corresponds bit for bit to the ADVISE_ACTIVE. A

 

 

bit on means that the corresponding alarm condition is enabled and will be detected. A bit off

 

 

means the corresponding alarm condition is disabled and will not be detected.

81

ADVISE_MASK

Mask of ADVISE_ALM. Corresponds bit for bit to ADVISE_ACTIVE. A bit on means that the

 

 

condition is masked out from alarming.

82

ADVISE_ACTIVE

Enumerated list of advisory conditions within a device.

3-9

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Emerson 848T Definewritelock, Saveconfignow, Saveconfigblocks, Startwithdefaults, Simulateio, Securityio, Simulatestate

848T specifications

The Emerson 848T is a state-of-the-art temperature transmitter designed for accurate and reliable temperature measurement in various industrial applications. This device has gained recognition for its advanced features and robust performance, making it a popular choice among engineers and technicians in the field.

One of the key highlights of the Emerson 848T is its unique dual-channel capability, which allows it to seamlessly monitor two temperature sources simultaneously. This functionality is particularly beneficial in processes where multiple temperature points need to be assessed, optimizing efficiency and reducing the need for additional equipment. It supports various sensor types, including thermocouples, RTDs, and resistance temperature detectors, making it versatile for different applications.

The 848T is equipped with sophisticated digital processing technology, which enhances its accuracy and stability. It features a 24-bit analog-to-digital converter, ensuring precise measurement and minimizing drift over time. Moreover, the device boasts a wide operating temperature range, accommodating ambient conditions from -40°C to 85°C. This durability makes it suitable for harsh environments commonly encountered in industries such as oil and gas, pharmaceuticals, and power generation.

Another significant characteristic of the Emerson 848T is its configurable output options. Users can choose from a range of output signals, including 4-20 mA, which provides a standard interface for integration into existing control systems. Additionally, it offers a HART communication protocol, allowing for easy configuration, calibration, and diagnostics through a digital interface. This feature enhances the transmitter's usability, enabling operators to perform adjustments without direct access to the device.

The device is designed with user-friendliness in mind. Its intuitive setup procedure and robust graphical user interface simplify the commissioning process, ensuring that even those new to the technology can easily navigate the system. An integrated LCD display provides real-time readings and status information, facilitating monitoring at a glance.

In summary, the Emerson 848T temperature transmitter combines reliable performance, user-friendly design, and advanced digital technologies. Its dual-channel capability, wide sensor compatibility, and adjustable output options make it an essential tool for achieving precise temperature measurements in various industrial settings. With these compelling features, the Emerson 848T stands out as a leading choice for professionals seeking accuracy and efficiency in their temperature monitoring applications.